Cushioning device for metal working machines



March 8, 1932. F. J. RODE 1,848,383

CUSHIONING DEVICE FOR METAL WORKING MACHINES Filed Dec. 15, 1950 5 Sheets-Sheet 1 F. J. RODE 1,848,383

CUSHIONING DEVICE FOR MniIAL WORKlNG MACHINES March 8, 1932.

3 Sheets-Sheet 2 Filed Dec. 15, 1930' March 8, 1932. F. J. RODE 1,843,383

I CUSHIONING DEVICE FOR METAL WORKING MACHINES Filed'Dec. 13, 1950 3 Sheets-Sheet 3 rnnnarcn J. Bonn, or GPICAGO, rumors, assrenoa T manennr'rn room a MFG.

.co-operating dies between which Patented Mar. 8, 1932 n s'rArs-s COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS Application filedIDecember 13, 1930. Serial 13'0. 5Q2,157.

This invention relates to improvements in cushioning device for metal working machines, of the type in which there is lprovided t e metal is worked, one die being reciprocable toward and away from the other die, the latter being movable under stress of the reciprocable die and being yieldingly resisted in such movement by means of a cushioning device, and one of the objects of the invention is to provide an improved valve mechanism for producing a variable resistance pressure in the cushioning device and which valve mechan1sm serves not only as a resistance pressure creating means but also serves as a check and operating valve.

A further object is to provide improved fluid pressure controlled means for seating or closing the valve and improved means whereby the valve may be unseated or opened by hydraulic pressure in addition to the pres sure created in the cushioning device.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this invention and in which Figure 1 is a view partly in elevation, partly in section, and partly broken away, of a machine of this character constructed in accordance with the principles of this inven-- tion.

Figure 2 is an enlarged detail sectional view of the valve mechanism and a portion' ings the numeral designates generally the. base of the machine, having uprights 11 pro-- vided with guides 12, in which latter a ram 13 operates.

A crank shaft 15 is" journaled in the uprights 11 and the cranks 16 thereof are connected by means of links 17 with the ram 13. A second crank shaft 18 is connected by means of a link 19 with a die 20 that cooperates with a die 21 that is secured to the ram 13, thereby producing a double action press. One of the crank shafts is rotated by means of a suitable gear 22 which in turn drlves the other crank shaft by means not shown. Suffice it to say, however, that the crank shafts 15 and 18 receive their motion from any suitable source.

Mounted upon the base 10 is a base plate 23 which supports a die 24 and the die 24 encompasses another the 25, the latter being supported. by means of a stem or projection depending therefrom, which passes through the bed plate 10 and rests upon a pressure pad 27 that has connected with it a piston 28 that moves in a cylinder 29, the latter being mounted upon a support 30 held in positlon by means of suitable hangers 31/ All of the above referred to parts are of the ordinary and well known construction,

ister with an opening 34 in the cylinder 29,

which latter constitutes both an inlet and outlet for the liquid.

The valve casing 30 is provided with a valve chamber '35 in which a valve 36 operates and this valve 36 co-operates with a seat 37 for controlling the passage 33.

Connected with the valve 36 is a piston 38 which is of a diameter greater than the diameter of the valve 36 and connected with the piston 38 is another piston 39 which moves in a chamber 40 that has communication with the valve chamber 35 through a passage 41,

afii in which passage 41 the piston 38 is mov-' a e.

The diameter of the piston 39 is considerably greater than the diameter of the piston 38, and leading into the chamber 40 on one side of the piston 39 is a pipe 42 through which fluid under pressure is supplied to the chamber 40 to operate against the piston 39 and move the latter together with the piston 38 and the valve 36 in a direction to cause the valve 36 to be seated and thereby close the passage 33.

Liquid is supplied to the cylinder 29 from a suitable tank or container 43 having an outlet 44 to which a pipe 45 is connected and the pipe 45. also communicates with the valve chamber 35 through an opening 46 and the opening 46 is arranged so as to have communication with the chamber 35 between the valve 36 and piston 38.

Fluid pressure is supplied to the tank or container 43 through a pipe 47 in which is arranged a pressure regulating valve 48 and a pressure gage 49, liquid being adapted to be supplied to the container 43 through a pipe 50 in which a valve 51 is arranged.

Leading from the pipe line 47 is a branch pipe 52 which has communication with a valve casing 53, in-which latter is provided a passage 54 with which the pipe 42 leading from the chamber 40 has communication.

The passage 54 is provided in one wall thereof with an opening 55 controlled by a valve 56 and the pipe 52 has communication with the passage 54 when the valve 56 is opened but communication between the pipe 52 and the passage 54 is cut off when the valve 56 is closed.

When the valve 56 is opened communication will be established between the branch supply pipe 52, in which latter a pressure regulating valve 57 and a pressure indicating gage 58 are arranged, and the pipe 42 through the passage 54 andthe opening 55, so that the fluid pressure will be directed into the chamber 40 to move the piston 39, piston 38 and valve 36 to seat the latter and hold it seated by a predetermined pressure.

When, however, the valve 56 is closed and a valve 59 controlling an opening 60 is opened 'as shown in Figure 4, and which opening 60 has communication with the passage 54, the supply of fluid to the chamber 40 through the pipe will be cut off and the chamber 40 will be opened to the atmosphere through a pipe 61 with which the opening 60 has communication. When the valve 59 is thus opened and the valve 56 is closed and the piston 39 is moved in the chamber 40 as the valve 36 is opened, the fluid in the chamber 40 will flow through the pipe 42 into the passage 54, through the opening 60 and out of the pipe 61 to the atmosphere, thereby relieving the pressure in the chamber 40 to permit the valve 36 to be unseated.

' Therefore, in order to control the operation of the valve 36 it is only necessary to control the operations of the valves 56 and 59. This is accomplished by means of a member 62 pivotally mounted intermediate its ends as at 63, portions 6465 of the member 62 being adapted to respectively engage the valve stem 66 and the valve stem 53 to cause one of the valves 5659 to be opened when the other is tion with the arm 7 0 on the member 62. The

valves 56 and 59 are normally closed by means of springs 71-7 2.

The member 67 may be rotated in any desired or suitable manner such as by means of a sprocket chain 73 passing over a suitable sprocket wheel secured to the shaft 74 of the member 67 and which sprocket chain also passes over another sprocket chain secured to a rotatable part of the machine, such as the shaft 7 5 of the gear 72. A

In operation and when the parts are in the position shown in Figure 1, the piston 28 will be in its uppermost position, that is in the top of the cylinder so as to hold the surface of the die 25 substantially flush with the surface of the die or work holder 24, and this position of the piston 28 is caused by pressure exerted upon the piston from the tank or container 43 when the valve 36 is opened, such fluid pressure also serving to return the piston to such a position.

Before the ram, in its lowering movement, contacts 7 with the work the valve 36 will closed by reason of fluid pressure exerted in I the chamber 40 upon the piston 39 and the degree of pressure by means of which the valve 36 is held seated is determined by the amount of resistance pressure it is desired to create in the cylinder 29 to the movement of the piston 28.

\Vhen the valve 36 is closed communication between the cylinder 29 and the tank or container 43 will be cut off, but the fluid pressure exerted from the container 43 in the valve and back to the container 43 through the opening 46 and pipe 45.

After the liquid has been forced from the cylinder 29, and when the piston 28 starts to ascend, liquid under pressure irom the container 43 will operate upon the piston 38 to open the valve 36 and will flow into the cyllnder 29 while the valve 36 remains open. The valve 36 will remain open until the piston 28 has reached the limit of its upward movement or until the pressure in the cylinder or chamber overcomes the pressure of the l1qu1d upon the piston 38.'

Thus it will be seen that with this improved valve mechanism there is not only provided a valve which will operate as a check, relief and operating valve, but the parts of the valve will be of a unitary construction and Wlll be arranged compactly and in a minimum space. This will materially reduce the cost of production and will simplify the operation of the valve as all springs'will be dispensed with and the valve will be positively. operated in both directions. 1

Obviously, the operation of the valves 56 and 59 will be in timed relation to the operation of the remaining portion of the machine. It is also obvious that the pressure in the cylinder or chamber 40 may becontrolled by the pressure regulating valve 57. Likewise the pressure in the tank or container 43 may be controlled by the pressure regulating valve 48.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction andm the combination and arrangement of the seV eral parts, within the scope of the claims,

without departing from the spirit of this invention.

What is claimed as new is 1. In a metal working press, a reciprocable ram, a pressure pad, an hydraulic cushion for yieldingly resisting the movement of said pad in one direction, variable resistance pressure creating means for controlling the pressure in said cushion, and fluid pressure controlled means for rendering said variable resistance pressure creating means inactive.

2. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yiel'dingly resisting the movement of the pad in one direction, variable resistance pressure creating means for controlling the pressure of the cushion, the said means embodying a valve to be unseated at a predetermined pressure in the cushion, and fluid pressure controlled means connected with the valve for unseating said valve.

3. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, a variable resistance pressure creating means for controlling the pressure in the cushion, said means embodymg a valve, fluid pressure means for seatmg and holding the valve upon its seat and against which latter fluid pressure said valve is adapted'to be unseated by a predetermined fluid pressure in the cushion, and additional fluid pressure controlled means for opening said valve.-

4-. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, a variable resistance pressure creating means for controlling the pressure in the cushion, said means embodying a valve,fluid pressure means for seating and holding the valve upon its seat and against which latter fluid pressure said valve is adapted to be unseated by a predetermined fluid pressure'in the cushion, additional fluid pressure controlled means for opening said valve, and means for controlling the first recited fluid pressure means.

5. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of said pad in one direction, a variable resistance pressure creating device embodying a valve, fluid pressure controlled means for seating and maintaining said valve seated and against which pressure the valve is adapted to be unseated by a predetermined pressure in the cushion, and fluid pressure controlled means operating in opposition to the fluid pressure which seats the valve, for opening said valve.

6. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of said pad in one direction, a variable resistance pressure creating device embodying a valve, fluid pressure controlled means for seating and maintaining said valve seated and against which pressure the valve is adapted to be unseated by a predetermined pressure in the cushion, fluid pressure controlled means operating in opposition to the fluid pressure which seats the valve, for opening said valve, and means for controlling the first recited fluid pressure means whereby the second recited fluid pressure controlled means will become active.

7 .7 In a metal working machine, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, a variable resistance pressure creating device embodying avalve, fluid pressure creating means for seating said valve and against which latter pressure the valve is adapted to be unseated by a predetermined pressure in the cushion, and means co-operating with said valve and against which means fluid under pressure being discharged into the cushioning means will act to open said valve, the last recited means being automatically rendered active by the unseating or opening of said valve.

8. In a metal working machine, a reciprocable ram, a pressure pad, a fluid pressure controlled cushion for yieldingly resisting the movement of the pad in one direction, said cushion embodying as a unitary structure a-valve casing, a valve therein, a fluid pressure chamber, a piston connected with the valve, means for admitting fluid pressure into said chamber for seatin .the valve and against which last recited fluid pressure the valve is adapted to be unseated by a predetermined pressure in the cushion, and means associated with said valve and arranged in said casing and against which last said means fluid pressure acts to opensaid valve at a pressure less than the pressure in said cushion.

9. In a metal working machine, a reciprocable ram, a-pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, variable resistance pressure creating means for controlling the pressure of the cushion, said means embodying a valve set'to be unseated at a predetermined pressure, and means other than said valve and upon which fluid pressure acts for unseating the valve.

10. In a metal working machine, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, variable resistance pressure creating means for controlling the pressure of the cushion, said means embodying a valve, fluid pressure means for holding the valve on its seat to be unseated at a predetermined pressure, means for releasing the last said pressure, and

means other than said valve and upon which last said means fluid pressure acts to unseat the valve.

11. In a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, variable resistance pressure creating means embodying a valve, means whereby fluid pressure will seat and maintain the valve seated and against which last said pressure the valve is adapted to be unseated, and means connected with said valve and against which last said means fluid pressure operates to unseatjhe valve, regardless of the pressure intn'e cushion.

12. 111 a metal working press, a reciprocable ram, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the. pad in one direction, variable resistance pressure creating means embodying a valve, means whereby fluid pressure will seat and maintain the valve seated and against which last said pressure the valve is adapted to be unseated, means connected with said valve and against which last said means fluid ressure operates to unseat the valve, regardless of the pressure in the cushion, and means whereby the fluid pressure against which the valve is to be opened may be controlled.

13. In a metal working machine, a pressure pad, a fluid pressure cushion for yield- 'ingly resisting the movement of the pad in one direction, said cushion embodyin a cylinder and piston relatively mova hle, means for maintaining a liquid column, a passage leading therefrom into the cylinder, a valve for controlling the admission of the liquid into and out of the cylinder, fluid pressure means for seating the valve and against which the valve is adapted to be unseated by a predetermined pressure in the cushion, and means. connected with said valve and upon which last said means fluid under pressure from said column will act to unseat the valve.

14. In a metal working machine, a pressure pad, a fluid pressure cushion for yieldingly resisting the movement of the pad in one direction, said cushion embodyin a cylinder and piston relatively mova le,

means for maintaining a liquid column, a

passage leading therefrom into the cylinder, a valve for controlling the admission of the liquid into and out of the cylinder, fluid pressure means for seating the valve and against which the valve is adapted to be unseated by a predetermined pressure in the cushion, and means connected with said valve and upon which last said means fluid pressure will act to open said valve.

In testimony whereof I have signed my name to this specification, on this 13th day of November, A. D. 1930.

FREDRICH J. RODE. 

